Luxman Lv-105

[Valerio]

hi global people, I need your help, could you send me a copy of instruction manual for ampli Luxman LV-105? My adress is v.frigati@virgilio.it
Thanks in advance for your interest

[Tony]

i also need schematic for the above amp, i had an lv105 which i fixed by taking good mosfets from this amp, the amps used the same trannies in the output stage-2sk405/2sj115...now all four mosfet output trannies are bad....for the lv103, i intend to replace the mosfet outputs with darlington bipolars byt modding the output drivers and bias circuits, but i need the schematics in order to proceed...


calling on netlist, please help!!!!

thanks a lot in advance....

[herringboy]

Hi all,
I just bought a 103 and do not have a manual - if anyone could help that would be great.
Also, can you change the valves in these for a better or differnt sound?
Cheers
Carl

[anatech]

Hey these sound pretty good actually!

You can modify the bias circuit to use IRFP fets (140 / 9140). They have low impedance gate drive, so you don't run into the IRFP140 gate charge issues as much. I would rather do that than modify for bipolar output, although it is not that hard to change. It's just that it would be a completely different animal then.
When replaceing the fets, check the gate resistors. If they open, you will blow the new parts for sure.

-Chris

[nuppe]

Hi, just wanted to tell you all, i bought two manuals for my Luxman L-114A (service & owners manual) from a guy called Sven Eiman in Sweden. He has a website were he sells manuals and spare parts for Luxman. I payed 110 sek (about 10 €) for both, and they were original in pristine condition. I think he delivers abroad too.

/Andreas

[max romeo 007]

Hi Everyone

I Have been on many web sites and forums looking for a FREE FRENCH copy of Luxman LV-103 or LV-105 owner's manual (PDF, Gif or Jpeg format) and I could not find any. If somebody can supply me one, it would be greatly appreciated. You can send me an e-mail at the following address: max_romeo_007@hotmail.com.
Have fun and be Happy
Max

[Netlist]

Originally posted by joan2

calling on netlist, please help!!!!

Sorry guys, nothing from Luxman here.

/Hugo

[ilimzn]

Originally posted by anatech
Hey these sound pretty good actually!

You can modify the bias circuit to use IRFP fets (140 / 9140). They have low impedance gate drive, so you don't run into the IRFP140 gate charge issues as much. I would rather do that than modify for bipolar output, although it is not that hard to change. It's just that it would be a completely different animal then.
When replaceing the fets, check the gate resistors. If they open, you will blow the new parts for sure.

-Chris

The mod you describe would only work for the 103 for sure (rail voltages!). You may find that IRFP240 and IRFP9140 are FAR better pairs than 140/9140 or 240/9240, assuming the rail voltage is below +-45V at all times. In fact, out of all IRFP parts, 240/9140 are the closest you get to true complementaries, rivaling even the actual lateral complementaries. On average, the P/N ch differences of this pair will be about the same as toleraces between any two parts of the same polarity. In contrast, IRFP140/9140 and 240/9240 differ between 30 and 50% in gain (gm). IRFP240/9140 differ below 5% and typically 3%, plus the capacitances are much better balanced between P and N.

I have also successfully repaired LV103 and LV105 with 2SJ162 and 2SK1058 LMOS, with no mods to the driver. The gate capacitances are still within limits for the driver.

[boraomega]

2SJ162 and 2SK1058 are much better and much closer replacement than any IRFP.

[anatech]

Hi ilimzn,
Correct on the 240 / 9240 's for the LV-105. I have easy access to the IRF parts in Canada, my good supplier for Japanese parts closed up shop due to economic reasons. These are from my Adcom stock .

I think my main point was to illustrate the driver circuit in the Luxman units was capable of driving the gates of the IRF parts ( the worst to drive as far as I'm concerned).

-Chris